Multiple choice

Which field of a IPv4 header limits the lifetime of a datagram?

  1. Internet Header Length (IHL)

  2. Differentiated Services Code Point (DSCP)

  3. Explicit Congestion Notification (ECN)

  4. Time To Live (TTL)

  5. Protocol

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Time to live (TTL) or hop limit is a mechanism that limits the lifespan or lifetime of data in a computer or network. TTL may be implemented as a counter or timestamp attached to or embedded in the data. Once the prescribed event count or timespan has elapsed, data is discarded.